Question

我想执行此查询：

INSERT INTO [Order] (FactorId, ProductId, Entity) 
VALUES((SELECT Top 1 FactorId FROM Factor WHERE UserId = @UserId AND Status = -1), @ProductId, @Entity)

但发生以下错误：

此处不允许使用子查询上下文。只有标量表达式允许的。

Answer 1

尝试

INSERT INTO [Order] (FactorId, ProductId, Entity) 
SELECT Top 1 FactorId, @ProductId, @Entity FROM Factor WHERE UserId = @UserId AND Status = -1

Answer 2

INSERT INTO [Order] (FactorId, ProductId, Entity) 
SELECT (select Top 1 FactorId FROM Factor WHERE UserId = @UserId AND Status = -1), 
@ProductId, @Entity

Answer 3

试试这个

INSERT INTO [Order] (FactorId, ProductId, Entity) 
(SELECT Top 1 FactorId, @ProductId, @Entity FROM Factor 
WHERE UserId = @UserId AND Status = -1)

注意：使用select不允许 VALUES 关键字:)插入查询。

Answer 4

如果您涉及其他专栏，请完全避开TOP 1，并考虑这样的事情......

INSERT INTO [Order] (FactorId, ProductId, Entity) 
SELECT FactorId, @ProductId, @Entity FROM Factor 
WHERE UserId = @UserId 
  AND Status = -1
  and timestamp = (select max(timestamp) from Factor where UserId = @UserId AND Status = -1)

如果您有排序顺序列或任何其他唯一列

，此概念也适用

SQL Server插入查询问题

4 个答案: